Period 1907-1939
Papers mainly from the period 1907-1939. Extensive correspondence with her niece Stella Ballantine 1917-1939, with Alexander Berkman 1904-1936, with her friend Frank G. Heiner 1934-1936 and with the American anarchist W.S. van Valkenburgh 1911-1938; correspondence with Henry G. Alsberg 1924-1936, An...

Period 1917-1919
Trotsky Papers (mainly carbon copies): correspondence between Lev Trotsky and Natalija Sedova and Lev Sedov 1931-1937; with and between various Trotskyists in Europe, including Eugen Bauer, Jeanne Martin, Raymond Molinier, Alexandra Pfemfert, Lev Sedov; letters from several correspondents in the Sov...